whonixsetup, when selecting "tor is censored in my area" says "Go add bridges to torrc and come back".
torrc.examples shows how to add bridges (but should obfs4 have the "managed" line?). It gives a link, but there is a better link:
However, once you have those bridges, it looks like you can copy and paste them into your torrc. A careful reading of torrc.examples shows that you need to put "bridge" before each line.
I can't remember: is host -> guest clipboard sharing enabled by default in the gateway ova?
Right now it's tough for a new user to connect via bridges. I'm thinking about how to make it easier.